... projects e.g. prospection, railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction2 ... , Ore exploration3. Small hole diameter water well drilling4. Geothermal pipe-installing for heat pump5. Small-diameter hole foundation ... 5 )Perfect frame's rigidity ,low center of gravity and good stability. HGY200D Core Drilling Rig for 200M,also for Water Well ...